The new over-used but not yet killed use of the original meaning of "but". Used to start short statements with the intention of emphasizing ones point on a particular topic.
Usually said very quickly so it sounds like a mumble, and is recipricated by another sentence beginning with "but", this goes on back and forth for quite a while un till someone decides to say "i know".

"But i am"
"But he is"
"But its not"
"But i cant"
"But they do"
"But i will"
"But we must"
"But i know"
"But you did"
etc....

Sam: "Dean is the hottest man in the world"
Sarah: "But he is"
Sam: "No, but he is"
Sarah: "But he is"
Sam: "I know"

A further bastardisation of the word buddy or bud. The welsh pronounciation the word bud delivers such abruptness on the D it is magically transformed into a letter never heard before by man. It is so mysterious that all one can hear after the clear "uh" sound of the word is silence due to the incapability of the non-welsh human mind to properly process such a sound. It's closest relative is the letter 'T'. The letter 'T' is therefore acceptably substituted until the rest of the human race is at such a stage that they may understand and therefore develop a symbol for such a letter.